The prehistoric shore village on Werd Island and in the Seeäckern area (northeast of Eschenz) are rich archeological sites that have contributed substantially to our understanding of the history of settlements in the narrow area around Lake Constance.

The two sites remained settled throughout the prehistoric epoch and into the early historical era.

[3] The first settlement of the island was made shortly after BC 4000th (Early Pfyn culture) and was part of a migration into subalpine wetlands during the beginning of the late Neolithic era.

A second settlement phase (late Pfyn culture) began after long break during the middle of the 4th millennium.

After this phase, an increase in the lake level put the entire island under water during the first half of the 3rd millennium.

The lake waters rose again, interrupting the island settlements until the final phase of the Late Bronze Age (9th century BC).

During this time, parts of a number of horse bridles were discovered, indicating that the island may have been a transportation hub due to its convenient location.

[3] A gold cup dating from the early bronze age, 2400–1600 BC, was found in Eschenz in 1916.

The Roman era Vicus of Tasgetium which developed south of the Rhine Bridge, probably in the 2nd and 3rd Centuries, had its nucleus in Untereschenz.

The settlement grew into the Kastell auf Burg in Stein am Rhein, which, together with fortifications in Pfyn and Arbon provided the Roman border defenses around Lake Constance.

From 1623 until 1798 the governor of the monastery of Einsiedeln held the low court at Castle Freudenfels in Eschenz.

Around the end of the 19th century, animal husbandry and agriculture replaced viticulture and fishing as the major industries.

[6] The municipality is located in Frauenfeld District, near the outflow of the Untersee portion of Lake Constance into the Rhine river.

[8] The age distribution, as of 2009[update], in Eschenz is; 154 children or 9.3% of the population are between 0 and 9 years old and 210 teenagers or 12.7% are between 10 and 19.

[15] The historical population is given in the following table:[5][16] Werd Island (a prehistoric lake shore settlement as well as the site of a Roman Vicus and bridge), Freudenfels Castle and the pilgrimage chapel of St. Otmar on Werd Island are listed as Swiss heritage sites of national significance.

From the 2000 census[update], 557 or 36.8% were Roman Catholic, while 663 or 43.8% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 14 or 45.2% are female, 2 or 6.5% are not Swiss citizens and 3 or 9.7% do not speak German natively.

At the lower primary level, there are 17 children or 35.4% of the total population who are female, 6 or 12.5% are not Swiss citizens and 5 or 10.4% do not speak German natively.

In the upper primary level, there are 22 or 46.8% who are female, 6 or 12.8% are not Swiss citizens and 5 or 10.6% do not speak German natively.

There are 67 teenagers who are in the advanced school, of which 36 or 53.7% are female, 6 or 9.0% are not Swiss citizens and 4 or 6.0% do not speak German natively.

There are 55 teenagers who are in the standard school, of which 26 or 47.3% are female, 14 or 25.5% are not Swiss citizens and 13 or 23.6% do not speak German natively.